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imaging

Techniques used to produce, process and retrieve image signals.

imaging instrument

Instrument or device used to obtain an image. For example, an imaging radar or imaging radiometer.

imaging radar

Radar capable of acquiring imagery of land surfaces and oceans, day and night, and in all weathers.

in-situ

In the field of space, in-situ observations describe observations performed on the ground, as opposed to satellite observations.

infrared montgolfiere

Airship heated naturally by the Earth’s infrared flux at night, augmented by solar radiation during the day.

injection point

Point in space at which a launch vehicle releases its satellite payload and imparts the required velocity to boost it into the target orbit.

interferometry

Measuring technique that exploits a phenomenon called interference. Interferometry determines the difference in the distances between a source of electromagnetic waves and 2 receivers placed a small distance apart. It works by measuring the phase difference of the received signals.

investigation test

Test designed to push an item of equipment to its operating limits, which may even destroy the equipment.

ionosphere

Layer of the upper atmosphere of Earth and certain other planets containing charged particles (electrons and ions).